Process for producing aromatic carboxylic acid

A kind of technology of aromatic carboxylic acid and aromatic compound, which is applied in the field of preparing aromatic carboxylic acid and can solve problems such as yield reduction and the like

Active Publication Date: 2005-11-02
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the solid is discarded in this manner, the yields of the steps are reduced, making the disposal of the solid problematic

Method used

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  • Process for producing aromatic carboxylic acid
  • Process for producing aromatic carboxylic acid

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Embodiment Construction

[0014] Incidentally, regarding the reference numerals and signs in the drawings, 1 denotes an oxidation reactor; 2 and 13, a crystallization tank; 3 and 14, a solid-liquid separator; 4 and 15, a dryer; 5 and 16, a recovery device; 11 represents the mixing tank; 21 represents the solvent component removal device; 22 represents the pipeline; 23 represents the spray device; A represents the alkyl aromatic compound; B represents the solvent; C, D and K represent the aromatic carboxylic acid slurry; E and L represent the aromatic carboxylic acid Filter cake; F and M stand for separated mother liquor; G stands for aromatic carboxylic acid crystal; H stands for water medium; I stands for solution; J stands for reduction treatment liquid; N stands for high-purity aromatic carboxylic acid crystal; Denotes liquid; X and Y denote recovered slurry.

[0015] The present invention will be described in detail below.

[0016] Generally, the aromatic carboxylic acid preparation method of the ...

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Abstract

A solid matter contained in a discharge gas resulting from a drying step is recovered and reutilized. The process, which is for producing an aromatic carboxylic acid, comprises (A) an oxidization step, (B) a solid-liquid separation step, (C) a cleaning step, and (D) a drying step and is characterized in that crystals of the aromatic carboxylic acid which accompany the discharge gas comprising a solvent vapor generated by evaporation and removal are brought into contact with a liquid in a recovery apparatus to recover the crystals and part or all of the crystals recovered are sent to the step (A).

Description

technical field [0001] The present invention relates to a method for preparing aromatic carboxylic acids. Background technique [0002] Generally, crude terephthalic acid is obtained by oxidation of p-xylene, etc., and a cake-like crude terephthalic acid containing acetic acid as a solvent is obtained through a solid-liquid separation step, and then dried to obtain crude terephthalic acid as a product. And, by dissolving the crude terephthalic acid in water, reducing impurities, performing crystallization, and then performing a solid-liquid separation step, purified hydrous terephthalic acid in cake form is obtained. By drying the cake of purified terephthalic acid, a purified terephthalic acid product is obtained. [0003] And, in all of the above cases, drying is performed using a dryer. When drying by this dryer, evaporated solvents such as acetic acid and water are exhausted outside the dryer along with the ventilation air flow used by the dryer. [0004] However, in ...

Claims

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Application Information

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IPC IPC(8): C07C51/265
CPCC07C51/265
Inventor 西尾胜福井胜彦仰木启训
Owner MITSUBISHI RAYON CO LTD
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